DISCUSSION OF SPECIES AND THEIR DISTRIBUTION. 11 



The French expedition obtained an individual. 230 millimeters long, at Station c.\i, in 

 the channel of St. Vincent. St. Antoine, in the Cape Verde Islands, at a depth of 580 meters. 



CENTROSCYLLIUM, Muller and Henle. 



Centroseyllium, Mi l.u i: and Benle, s. B. Plag., 1841, 191 [type Spinox Fabrieii Reinhardt].— Jordan and 



GlLBl RT, U)C. rit. 



Spinacoids with teeth equal in both jaws, small, straight, pointed, each with one or two 

 smaller ensps on each side at base; mouth crescent-shaped, with a straight, oblique groove 

 at angle: spiracles medium: branchial openings rather narrow: two dorsal fins, each with 

 a strong spine; the second entirely behind the ventrals. 



CENTROSCYLLIUM FABRICLI, (Reinhardt), Moller and Henle. (Figure 7.) 



Spinax fabrieii, Reinhardt, Dansk. Vid. Selsk. Forh., in, 1828, xvi. 



Centroseyllium fabrieii, Mi t.i.i t: and Henle, op. cit., 191. — Dumeril, Elasmobr., -Hit.— GOnther, Cut. I'isli. 



Brit. Miis.. vm, 425.— G< : ami Bean, BuU. Essex Inst., xi, 1879, 30.— Vaillant, Travailleur an. I 



Talisman, 73.— Jordan ami Gilbert, Bull. xvi. U. s. Nat. Mus., 1883, 6. 



Body somewhat rounded, covered with minute stellate scales; dorsal tins short, each 

 preceded by a strong spine; teeth in both jaws tricuspid, small; color, dark brown. 



This little shark, previously known only from the coast of Greenland, has, since L878, 

 been found to be common on the offshore banks at depths of 150 or more fathoms in com- 

 pany with Centroscymnus. Vaillanfs assignment of a specimen from the Banc d'Arguin, 

 750 fathoms, to this species, is at best very questionable. 



A young individual, probably G. Fabrieii, was taken at station 2377, February 11. 

 188.3. Colors: "All the tins whitish, except caudal, which is yellowish; dorsals with a nar- 

 row black stripe anteriorly: tip and lower lobe of caudal with very broad black margin; 

 iris greenish golden; sides with several lines made up of dark dashes." 



CENTROSCYLLIUM GRANULATUM, Gunther. 

 Centroseyllium granulation, GOnther, ( hallenger Report, xxn, 7. 



This form is evidently, as Dr. Gunther indicates, very closely allied to Centroseyllium 

 Fabrieii, having the same disposition of the tins, size of teeth, and dorsal spines, but the 

 epidermoid productions of the head and body are much coarser and in the form of granula- 

 tions, whilst in Centroseyllium Fabrieii they are minute. 



One specimen, 11 inches long, badly mutilated, was obtained by the Challenger at 

 Port Stanley, Falkland Islands, station 311; depth 245 fathoms. 



SCYMNODON, Boeage and Capello. 

 Scymnodon, BocaGE and Capello, Proc. Zool. Soc., 1864, 263 [type S. ringens, I'.. & C.]. 



Spinacoids, with teeth in upper jaw simply pointed, and teeth in lower jaw more or less 

 erect, triangular. Scales leaf-shaped, with three strong ribs, each terminating in a point 

 below. Dorsal tins small, low, each preceded by a small spine. 



A single species, 8. ringens, from deep waters off the coast of Portugal, has been 

 described. [Boeage and Capello, Inc. cit.— Gunther, Cat. Fish. Brit. Mus., vui, 423.] 



SCYMNODON RINGENS, Bocage and Capello. (FignrelS.) 



Scymnodon ringens, Bocage and Capello, P.Z.S., 1864, 263, tig. 5; Peix. Plagiost., i. pi. i. tig. 1. 

 Centrophorus ringens, GOnther, Cat., vm. 423.— Capello, Jorn. Acad. s. . Lisboa, n, 145, fig. of the teeth; 

 Cat. Peix. Port., 1880, lit. Casts of Portugal. Rare, i Lisbon and Setnbal. | 



A Scymnodon with labial groove extending for some distance along the margins of jaws. 

 I ppei teeth small, narrow, lanceolate; lower teeth more or less erect, triangular; the lateral 

 ones somewhat inclined backward. Distance between nostrils one-half length of snout. 

 Lower angle of pectoral rounded, not produced. Dorsal spines feeble, projecting but 



